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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba20bc346cb2a4d099ad5e328456d664cffb8055638b690c0ee45a879aa965e' 
  AND token = '+FldxqgvWuX1RfTxMgC6/B52+ERwbk2AdUxnSpos5Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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