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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e03c2af53beae634f003e599d6a773b9f62c125f0f25e11ddcc3b3d3ad4d1d8' 
  AND token = 'P3dM6pCDWB36/8sDYJljpREXJruvX6NSB1KXigWSqpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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