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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53e94e8a5dad9e30345465e9b8a97561edca5ac77df13df5072373ef6f7b282' 
  AND token = 'e8Cg0QaHKqLSMiOYW87Wy0FRsBhyGpyfDFVoJTwS1+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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