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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca0ca57b2ed61890eeeb9f942d5491e5ab0add8510f03d83eb339421085ed14' 
  AND token = 'b6TXywpB9U/pq1WJiC9I7Fxt9Jnaitd9GPcIkEQ2Puk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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