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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8eeb776ba00a72b14446a3ed7219f2c4b517d3a86df3b273f99fb6b42a79f1c' 
  AND token = 'FIyPT7ClDlB1aPWF69Hf/79ESC8xgUJYicQgrSvdO/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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