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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ab4b7462c69d7a1a5389c6ae3e888ac9d93ece5b8d999c80125dedb3f0cee5' 
  AND token = 'rejF+u50s4J1y9VWWgTAvMtybW6z1YMOg559Sk086AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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