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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332833e4bcbdab937dc7a17326785a7ab271701c139a4f33e36aef8dc4d00c9d' 
  AND token = 'zDOrLeny7srozLrBWsQry+9L1spyZcPUqhLXlRMi4KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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