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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85c9d965274a67451c77317b5ef8578e4d27716f42ce1c0733931e4403758ae' 
  AND token = '9GpeefkrA6AGsH5wrwqE9URt0BnIlWsdyi6Rk2IHMAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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