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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba63bd9dff7751891d2d5d8d16c3c71e8cc6105d6ed369ae1a6ba218662655e3' 
  AND token = 'eYJp9mn20A41nO2SiQBrCyvT/wMV8/vBGsdjvr//xRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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