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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77b981f809618f105b1cf10fe35626a30684d8b28eea3962a8065af68c95c8a' 
  AND token = '3mS5S1mLyMVS58U5AycWZLvRRHZ8ijY+OPvRvw/Dedg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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