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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4f0ee2785c1c37886f98666a34a23d21b89890b0288f0bb54a48cf0f651de8' 
  AND token = 'TzU+K4O1z98MpYZcS0X+DvPbrwJxcsLcEqet7b1XH+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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