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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2745b95c5859e3655033a3e5edde8d5fbe5fc9f94b973c5cbbcb63e71abc2d1' 
  AND token = 'gIJudBdTF+EsTSEi4CUNFxtyo7ftoSKKkD9aJ82mXlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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