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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba7fcd0b8038b9889989b1326c6641485b2c9ef68c577f3c8e586641dcff53f' 
  AND token = 'GIvWbDiGbgmgJsDK1ZbvBR4Fngrkc+Fe/n2W3nJeAGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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