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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2466e0c077e0e63e63dc4d96865cd8780ef23f7093c6507e2ece8deb88c3ce1a' 
  AND token = '7dNBqQgIHOMvSWMpdNc4o0jQNcaWsDA0oyIg0U+Qllk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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