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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af7acd6567282651f5672933a5f089eea3858a3eafec86748316452ddc1d4c9' 
  AND token = 'Qb6bfFrOMOkMuYtXWcsy0bZ6I3qmCo4Irfb6P4B5zYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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