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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300d83b6f36caec261a782c54baef332c462b24e069a31a6bb4925587efcc7ae' 
  AND token = 'QVxi2C8xkjk6Lkh2HZpzJ60/3onUIvF2DbQoPG9vNCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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