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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b7c9eba4a6c45467b0a22a9b79de5ced81d2d378433a0821cb237d0008589d' 
  AND token = '9zaDAdu7MIqz6cN1eGckrU4uhXPlWI5CQ+8dFAuM85U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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