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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7fc1844bc121fa31e9cfd5d4b97d9c944505bea7dd10e6e0377ff43ca8387b' 
  AND token = '/DBxbWZMSoTJ7vOZ9NcM9Tv/nfe1RlD36AzcvOVmn38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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