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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70fb11becc6121032902855420be8d7bc4378415811716535a9b4da31df5ca1' 
  AND token = 'GGuFrivTt+piDNhvCG5npQlTjg5NApz55je5tVdRrXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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