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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f72f3384f00f23bc0a4a37b1d5ccab5bb2156222aab541263b7cf677e342d7' 
  AND token = 'qlS+78X3GJQxTa6BBFePG2NCcSjqrw2cPe86IAFOj5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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