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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1384dae16fe7421f09897718f4fc2ef2e8025a1f1ce1ee7050b9cf2d972d97b' 
  AND token = 'y8D5U50PxJxO7qByjVstC3h8S0Qy1g9aXZdh29Munt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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