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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb7a5cc4c6bb17f8133c258b5c9da2e2e74d8655202fecb1d4088724bcc23c5' 
  AND token = 'pqlvz29MsDn4cVwDmaap/PO+6w4CTF1KVbuVGC2Skrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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