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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd088d12d6dd43e9b1b357cf3c476fbacb101e48b5c956dc1e40452bbf44b971e' 
  AND token = 'ofUFOovmxo6BBIrUOakdfvEL7JxAKR6cDBvHTRCa/aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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