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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8a65bf2907c26d075128ed36f537c8489df2ca431d2c668de87e66223aa6ba' 
  AND token = 'v+cUMYMdCScoqLMAw8bKWXD2ca8OMsTM1RnQrFIXCXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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