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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f020307956adefb71f5c130e8646793a7b1385df4a317d5b9c75d39fbe307b8' 
  AND token = 'prZMf6t+5KqXiLiirKHRVLunNyBEZWnTW13Tz88Ur4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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