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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3916fd6f01d6f29d8ad2aab380325d47e34d69962727d2bf4510cb3080117c' 
  AND token = '4Ym5yaE1puqf5xUrwyWTVcR/LW7DxrqVL/vQVD/oL90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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