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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24305cba212c6c7423d3f8371b22f3623613150852b02a1d7a4540075fff051b' 
  AND token = 'jSXuBQkVsa46zjU8gwGU0PRQLr2wUj3YN6gYMMKm4WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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