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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a114b6c7515a03e11f9a8c02710a13bfbcf6b4e6ee7712889380b881292f5cf8' 
  AND token = 'mQI7Os1WDyD2nnyK5CN/owkVflJinndXIZ1cjm38YXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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