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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0eae7071207a6690d4a9892aed82a5cefff081d4933532debb051aebf0a937a' 
  AND token = 'qe3sX4fPWlfW0noUhOp43ZWnkj9jz7/0pcKUdMR/4lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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