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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb8933aa01f540163aa9368d7a56405ce12adc9ca56a77bcf918d303ef87890' 
  AND token = 'Xg5IcOcnul2+7PDQnySJcSkabJWB1VLwPmIWU9VbjUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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