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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bcecd6c8a84ffafd3bfa50528250c42d1fc80a128574dba80f3e677080c036' 
  AND token = '7TBetw+Wv8OTM76ACHfc/HX0pJVdhjiMvYQi7gbtLPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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