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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f8abf69846b97e8710750510ae8055e63363a8538bffc173544b692acb7706' 
  AND token = 'GArE58WjW19HvPlRedehEkL48Ky1amCep2rXTfOOrqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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