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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c8d0ca712a3591e0b217d57b474fe8fdc544ed0f904de3a38de09a43e3667e' 
  AND token = '3LocWwzhq+N31QyH6kmeS5kQYmCxqnTC8I7XGipNwVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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