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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3857ef92c76eec89459a41996609ace001531e0b958563d2a910051d9a8dfbf' 
  AND token = 'cLL2NAmV0xsPLPgFL9e2+8+fl+G0orV9uA39rooRoTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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