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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa92d592dfa04a26c99213df8a050c2ab8e99e1077b7b61eac5be8cc2141f8d' 
  AND token = '3sHUvTSZEj+UOi1E2wjiBAjdGj5Fk/k/oc1uILJq4/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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