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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c02108db82cc6774c9aa1000959571fd5d2cf6c897e5fb85c225533e5d8fee' 
  AND token = 'BxOjKxmFnR0GRCL+W8pkmlT5hIJEvk2SaSV8gXGRULk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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