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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bd7e97c26d7d27c66727455fec06e8e25ae3b9a6f4c6abf0dd4535fddcef74' 
  AND token = '9kgtSZmRHdM3QGAgAXKaiGOiF+LqhC/tI+Cd0B+ltO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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