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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f09eb4d485c9f011130c16d8d1ef763f15669900d0bfccabb9105d8611a194' 
  AND token = '7C+8xt9CY3jg1rsgujMsNpHP8OMUrQcQn9ydJkAgQMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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