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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664dbd6413d638a07ef3dfc2efe76203829d577deca550517ed7b49998596059' 
  AND token = 'i+27+6MEuDXwsv5xRdArRcaGoHEAG/9RaH+0Mxs30hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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