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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced8432274fafd3c9ed7d8c64867368671d08460c78c71e380a020ff2becf214' 
  AND token = 'QsVZ40kA2p2juUzYqLX0ndvR36cPWKv27l4C+A14xU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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