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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef06f5bcba6874421b89397eb2e625271c5d75fb06e2169d682e8fb5bf6ed9e8' 
  AND token = 'eFplBEDqrfLBm/OTf+r6DjoTXZ0XM/9pkIvsNgazAsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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