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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13de3b140fe33f5ba1f80e289f3c5903495736e723679a5efc7dc2efc570e9db' 
  AND token = '2PiIbV4RaLAd5cbPI52KC5rkcPXBW6hPdh2RH1Y62GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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