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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf60417465d842ae0b2191416e74c78c92aa35aba9d6129d610223242466adf' 
  AND token = 'Ho4NDgHooxAXGyCkq+Q2fzs7M6a2DuDU9AlL1jSsgwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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