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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e16d5ce3386a785cf181725a32bea643a12faa30f719234e1ba66519bf900fd' 
  AND token = '9xrC5nORrQnqD6AMf7sQXOCztcT1vBLi2x/whDAHWJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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