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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223aa6296f9085788d92b8225fc4af16ced5c0b668c3a33d16c4431aa0ead4ad' 
  AND token = '6urifznOyC0yRQWFE2Tw45+Wf1HJ5SBsIh/TKMW+nfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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