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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692366aaa84cb2a520e2fb8a86d7893f025a458961aa65c26335535980594ad1' 
  AND token = 'v7qmnejxUa2nNZnp39whZhGStWZV4ddSRSu5JhoB2+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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