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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b745d7185e476e5fcea2037cc1e4198f224d99136a56a85b60247ff259e4af0c' 
  AND token = 'fJwkWXDylL0hh7hImwK8pupCWCe1pMOAiAdFkM2AywE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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