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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa509b93dcb0f1783c3195392aa0bd49665a6310db1e115651fd857167d6839' 
  AND token = 'fhl41x2fHhaiZ6/sKOg5NNjP9PgdsuJVMK0lf4wkAjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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