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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbb7300be37aa40398909b6f8e20ce8364bc5a45348b98b2ac6b342664ad98e' 
  AND token = 'ynBurGZwCc8/xJw3Sghw9ekcmyS25P273R4w8Fv/3r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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