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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2356fdb49f9db0005ac530362e6b411b94ccd1bdb83cd6f4f4cbe30018ecffc7' 
  AND token = 'vKnXx2oo8Dekwe3nbAuA3B4GRHxT6ItS2LMATOKfq/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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