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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e7e03a19a9b7f746a2d09b9592248a870d49eeb6af4521900ca3eab91ae975' 
  AND token = 'iWX/SBfAiN/qtvAFE9X993m0xEguXRti1198fjt2PY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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