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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a4342c92c304797a438afe4987d4a71044ed39dcc18522b8653d50388b8f06' 
  AND token = 'KkWy+mNYZxkLGx8m0gobSsDe1sl/QfxYrot5SzDZz6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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