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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f33519433b3251625701b735e1effbadf93cc751c05f0ff77bad2f0ee6968506' 
  AND token = 'QvVsJPmFdZMd2Ire1BuqzrIN4B78EEIHOJ7rUAOyY5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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