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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab322f6f5dd72e37ba2c1f074ec1d0edbcb409dfed3ef28111b7b8c4155f7af' 
  AND token = 'NAZt2DLJEmB5ci/boHE1RWCoqr8+KThfrtgcw4gvF6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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