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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039ab34cffd5770c0a7a76a79c16cc861ab2b5c2b0f2586f48fec72ba81923c7' 
  AND token = 'lK9dbR2UttaUzdZHfU1eW7NfX2kMc9cu8FArd5pRnZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}