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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4970649cfd4fc35fd7cf1154e993f329faff8e9bad317c411abd904029e27520' 
  AND token = 'nGxTIDNKzoXOHMDj2qqUl0GzvyYy9AASyTp0HICLKxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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