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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f3733551bce089f9206839ff5add6363fbcfc275b680618aa2a6e88fd94b56' 
  AND token = 'RA32+9WJ94Yrubup6fRbGHhCVWuYVnbk3zFjsP03ju8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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