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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8eaae637b866129f1fa49cb75a2cb63d8b413d75a5cd870f68f92535f99d9f1' 
  AND token = 'ag9TnlvonpOc++/71pJm1QbJfvgl6k+Ak5PPdeMor5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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